Bluetooth: Controller: Fix not clearing Static Random Address on reset

When host issue HCI Reset controller should clear LE Static Random
address. Otherwise controller may incorrectly use one from before
HCI reset insread of rejecting HCI commands.

This was affecting following qualification test cases:
HCI/CCO/BI-51-C
HCI/CCO/BI-53-C
HCI/CCO/BI-54-C
HCI/CCO/BI-56-C
HCI/DDI/BI-06-C
HCI/DDI/BI-07-C

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>